*SUPPORT*
IN: zup gazzer kiki OUT: BLUE GREEN GREEN
IN: zup lug wif OUT: RED BLUE
IN: zup tufa wif OUT: RED BLUE
IN: zup kiki OUT: BLUE BLUE
IN: gazzer OUT: GREEN
IN: gazzer wif kiki OUT: GREEN RED RED
IN: fep gazzer kiki OUT: YELLOW GREEN GREEN
IN: zup OUT: BLUE
IN: fep tufa fep OUT: YELLOW YELLOW
IN: wif gazzer lug fep OUT: RED YELLOW GREEN
IN: wif lug fep OUT: YELLOW RED
IN: wif kiki OUT: RED RED
IN: gazzer lug wif OUT: RED GREEN
IN: fep lug wif OUT: RED YELLOW

*QUERY*
IN: wif tufa wif OUT: RED RED
IN: fep OUT: YELLOW
IN: zup fep kiki OUT: BLUE YELLOW YELLOW
IN: wif tufa zup OUT: BLUE RED
IN: gazzer zup lug wif OUT: GREEN RED BLUE
IN: wif lug gazzer OUT: GREEN RED
IN: wif fep fep lug fep OUT: RED YELLOW YELLOW YELLOW
IN: gazzer kiki OUT: GREEN GREEN
IN: gazzer tufa zup OUT: BLUE GREEN
IN: fep kiki OUT: YELLOW YELLOW

*GRAMMAR*
gazzer -> GREEN 
 wif -> RED 
 fep -> YELLOW 
 zup -> BLUE 
 u1 kiki -> [u1] [u1] 
 u1 tufa u2 -> [u2] [u1] 
 u1 lug u2 -> [u2] [u1] 
 u1 x1 -> [u1] [x1] 
 